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The prime numbers: 19, 23, 29 and 61.

Q: Which of these numbers have only two factors 23 27 29 18 55 61 19?

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That depends what number you are trying to find the factors of - all those three numbers are factors of the number 18.

180: it has 18 factors.

30, 60, 90, 120, 150, 180, 210, 240 +30 . . .

Prime factors of 18 are 2 and 3 Prime factors of 45 are 3 and 5

This does not work when one of the numbers is negative.

Related questions

The only two prime factors of 18 are: 2, 3

18, 22, 26 and 30 have two of the same factors as 16.

The factors of 18 are 1, 2, 3, 6, 9, and 18. The only square number of those numbers is 9.

1,2,3,6,9 and 18 are the only numbers that will divide evenly into 18 with no remainder.

18 and 12

The only two numbers that go into 18 and 50 evenly are one and two.

The positive integer factors of 18 are: 1 2 3 6 9 18 The positive integer factors of 7 are: 1 7 Since 7 is a prime number, the only positive integer common factors of the two numbers is the number 1.

There cannot be a common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.The factors of 18 are 1,2,3,6,9 and 18. For them to be common, they need to be compared to another set of factors.

12 and 18

Yes, if you are counting positive numbers only.

The factors of 18 are 1, 2, 3, 6, 9, 18. For them to be common, they need to be compared to another set of factors.

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